from math import pi, sqrt
def cairo_draw( cr, w, h ):
	def draw_circle( x, r, level ):
		cr.arc( x, h/2, r, 0, 2*pi)
		cr.stroke() 
		if level > 1:
			level = level - 1
			draw_circle( x - r/2, r/2, level )
			draw_circle( x + r/2, r/2, level )

	cr.set_source_rgb(0, 0,0)
	draw_circle( w/2, w/2, 6 )
	return 

